Apparatus for grinding and stropping hollow ground razor blades



Dec. 4, 1934. L. BRYLSKI 1,

APPARATUS FOR GRINDING AND STROPPING HOLLOW GROUND RAZOR BLADES Filed April 19, 1932 Patented Dec. 4, 1934 UNITED STATES APPARATUS FOR GRINDING AND STROP PING HOLLOW GROUND RAZOR BLADES Lukas Brylski, Mikultschut z, Germany Application April 19, 1932, Serial-No. 606,202

.In Germany May 2,1930

I i'olaim. (0151- 1)] This invention relates to an apparatusfm grinding and stropping hollow ground razor blades employing two parallel rotary grinding bodies with spring supported segments shiftable in radialdirection and having, in knownmanner,dif

ferent coverings for the grinding and stropping, and also a razor-blade holder adjustable in height. The apparatus according to the invention differs from the known, apparatuses of this type in that the curved segments of each grinding body are situated on circumferences of concentric circles of different sizes and supported by springs of different strengths,v the supporting springs of high segments with smooth leather coverings being of stronger resiliency than those of the diametrically oppositely situated segments with rough leather coverings, so that the hollow ground razor blades are alternately ground and stropped or only stropped during the turning of the grinding bodies. Thus, the further advantage is obtained that, owing to the differently mounted segments, the force is completely utilized for restropping.

An embodiment of the invention is illustrated by way of example in the accompanying drawing in which:-

Fig. 1 shows in front elevation the apparatus without protecting covering with razor blade pushed in.

Fig. 2 is a top plan view of Fig. 1.

Fig. 3 is a section on line II' of Fig. 1.

Fig. 4 is a side elevation of the apparatus seen in the direction of the arrow II showing the driving mechanism.

vided with rough and smooth leather coverings relative to the razor blade edge, when the apparatus is set for stropping.

The rotary grinding bodies consist each of two end plates 1, which are rigidly connected in each body by two sheet metal strips 2 and have hubs 3,

the journals 4 of which are mounted in corresponding apertures in end plates 5 of the frame. The journals 4 project, on the side facing the crank 6, through the end plate 5 and carry a toothed wheel 9. 'The toothed wheels 9 intermesh and are driven from the crank shaft 11 through the intermediary of a back gear wheel 10. The driving crank 6 has a toothed clutch 12 which in known manner allows the grinding bodies to be rotated only in one direction in that this clutch engages a pin 13 on the driving shaft and transmitsthe movement of the crank 6 to the driving shaft 11. Each of the parallel grinding bodies is provided with curved sheet metal Fig. 5 shows the position of the segments proseg'ments14 which, according to the invention, are mounted on screw pins 18 of different lengths so that the segments are situated at different distances from the axis of the grinding bodies. These pins 18 extend from the segments 14 through the metal strips 2 and carry on their ends nuts 19which thus connect the segments 14 to the strips 2. The segment on the longer pin 18 ofeach grinding body is covered in known manner with a smooth leather strip 15 and the other with a rough leather strip 16. These coverings are clamped onthe segments 14 by means of segments 17. The segments 14, 1'7 are held together by means of screws 18 with nuts 19' which screws also extend with their free ends through the connecting metal strips 2 and, by means of nuts 19 on theinner side of the strips 2, hold the segments 14, 1'7 with the leather strips 15, 16. The screws 18 of the segments 14, 1'7 with the leather covering 15 are longer than those for the segments 14, 1'7 with the leather covering 16..

Between the sheet metal strips 2 andthe segments 1'7, springs 20 and 21 respectively are slipped onto the screws 18 shiftably mounted in the connecting strips 2, which springs press the segments outwards in radial direction. The arrangement according to the invention is such that springs supporting the segments with rough leather covering 16 are less resilient than those supporting the segments with smooth leather covering 15. Consequently during the rotation of the grinding bodies the razor blade will be subjected alternately to a heavy pass by the rough leather covering 16 supported by the stronger springs, and to a light pass by the smooth leather coverings 15 supported by the weaker springs.

For holding the hollow ground razor blades, a blade holder 24 is provided which grips the thick back of the razor blade and the razor shank from both sides. The blade holder consists of two halves pressed together by a spring 25. The portion gripping the razor shank projects from the frame. The blade holder has guides 26, by means of which it can move up and down on guide bars 28 of a bridge 27 connecting the upper sides of the end plates of the frame. Screws 29 are provided for pressing together the two blade holder halves, and these screws are actuated by thumb nuts 30. The vertical adjustment of the blade holder is effected by a spindle 31 the thread for which is in the bridge 27. To facilitate its operation, the spindle has a knob 32. One half of the blade holder 24 has two elongated, laterally bent projections 22 which may be spread apart and then allow the introduction of the razor its blades. The above mentioned adjustment mark 23 on the frame has an extension 33 which serves for accurately adjusting the razor blade for stropping or grinding before starting to use the apparatus. The entire mechanism, the grinding bodies and the blade holder, are mounted on the end plates 5, which are rigidly connected by means of metal bars-3'4, and thus form a: carrying frame. The carrying frame may be enclosed in a protecting casing 35 shown in dotted lines in the drawing.

One half of the razor blade holder 24 is opened by spreading the projections 22: and the razor blade is slipped into the blade holder 24,, its thick back being clamped therein by means of the screws 29 actuated by the thumb nuts 30. The blade is then adjusted to the proper position for grinding and stropping by means of the spindle 31 carrying the holder 24 and rotatable by means of the knob 32. The crank shaft is then rotatedby means of a crank,v through the intermediary of the toothed. wheels 9, and rotates in opposite directions, the cylinders, carrying the leather strips 15, 16 resiliently supported. on segments, causing these strips to brush alternately against the two sides of the blade thereby grinding and stropping the inserted blade. As the segments carrying the smooth strips 15 have a difierent curvature to and are supported on. stronger springs than those carrying the rough. strips 16,

the blades are sharpened in that the fine grind effected by the rough leather strips 16 is always polished by a polishing pass efiected by the smooth leather strips supported on stronger springs.

I claim:-

An apparatus for grinding and stropping hollow razor blades, comprising. in combination a frame, two parallel rotatable grinding bodies mounted in said frame, two diametrically opposite curved segments situated one on each side of each of said grinding bodies on the circumference of concentric circles of different diameters, spring supporting means of different strengths for said segments those for the segments on the circumference of the larger circle being stronger than those for the segments on the circumference of the smaller circle, smooth leather coverings on the segments on the circumference of the larger circle, rough leather coverings on the segments on the circumference of the smaller circle, means for rotating said grinding bodies, and av blade holder vertically adjustable in said frame adapted to bring the. blade into contact with both segments on each of said grinding bodies so that the blades are alternately ground and stropped and to lift the blade relative to said grinding bodies so that only the smooth coverings on the segments on the circumference of the largercircle come into contact with the blade and only strop the blade.

LUKAS BRYLSKI. 

